Plastic sealing cements



Patented Nov. 27, 1945 2,389,926 PLASTIC SEALING CEMENTS John D. Morgan, South Orange-and Russell E. Lowe, East Orange, N. 3., assignors to Cities Service Oil Company, New York, N. Y., a corporation of Pennsylvania No Drawing. Application April 6, 1943.

I Serial No. 481,998 a 2 Claims.

market which are used for waterproofing and repairing roofs, and as expansion joints for roads. sidewalks and the like, as well as calking compounds for structures such as door and window frames'to seal the joint between the frames and the structure in which they are mounted. Such cements must make a permanent adhesive joint which will not open under expansion and contraction of the structures forming the joints. It is important also that the cements must be plastic to provide for expansion and should have such temperature characteristics that they will not now out of joints when heated to comparatively high atmospheric temperatures, In addition to this the cements should be waterproof and must not oxidize and harden when exposed to the air. The primary object of the present invention is to provide a plastic cement for sealing joints which is very adhesive and retains its plasticity over a wide temperature range.

Another object of the invention is to provide a bituminous joint sealing cement which is waterprooi and which does not oxidize or harden by exposure tothe air and sun.

With these and other objects in view the invention consists in the plastic sealing cement hereinafter described and particularly defined in the claims.

The preferred plastic sealing cement has a composition of a'sphaltic road oil 90 percent by weight and lithium stearate percent by weight. It has been found that the proportion of road oil may vary between '70 and 90 percent while the stearate is varied between 30 and 10 percent.

An asphaltic road oil which has been found to be very satisfactory is made by topping Mexican Panuco crude oil and then blending or cut ting back the topped crude oil with No. 2 furnace oil t make the finished road oil. The finished road oil consists of 87 percent of topped Panuco crude which has a flash of 180 to 200 F. Cleveland open cup with '13 percent of No. 2 furnace oil. The finished product has'an A. P. I. gravity of approximately 13.6 and a flash of approximately 160 F. Cleveland open cup. with a viscosity of 191 at 122 F. Furol.

The No. 2 furnace oil which has'been used is a product similar to a kerosene which has a flash of 115 to 170 1''. Cleveland open, cup, a distillation of 10 percent at 440, 90 percent at 600, and an end point 0! 650. g

A very important ingredient in the plastic sealing cement is the lithium stearate. Thisproduct has a very high boiling point and cannot b colloidally dissolved in the asphaltic road oil a temperatures below 400 F. The stearate fur thermore has a very important viscosity modify lng effect which tends to keep the cement in stable plastic form. Furthermore. the stearat when colloidally dissolved in the road oil pro tects the road oil and makes it substantialli non-oxidizing.

To make the composition the road oil is heater to 200 F. and lithium stearate is added whil passing the material through a mixing machin which preferably is a homogenizing mixer. Th heating and agitation continue until the mixtur is raised to a temperature of 430 and is a col loidally dispersed mass. After the mixture ha been heated and thoroughly mixed at a tem perature at least as high as 430 E, it is run int chill pans and rapidly cooled in thin layer: After it has been congealed the product may I: worked in a kneading machine to put it into plastic form for packaging. i

It is round that by the homogenizing actio the asphalt oil is the dispersed phase and tll lithium stearate is the continuous phase. Th continuous phase lithium steal-ate eflectlvel coats the asphaltic material and protects it fro: oxidation. This colloidal disperson, however, very adhesive and will adhere firmly to W001 masonry structures, and metals so that it is we adapted for sealing all types of structural build ing joints.

Extensive experiments have been carried on i find whether other metallic soaps such as sodium potassium, calcium and aluminum stearates an oleates were suitable to replace the lithium ate: rate but it has been found that none of the! soaps has the ability to protect the mlxtui against oxidation and none seems to form 1;! same type of colloidal solution of the road oil.

The preferred form of the invention havir been thus described, what is claimed as new is:

1. A plastic sealing cement consisting of is phaltic road oil oiapproximately 13.6 gravlt viscosity of 191 at 122 1". Furol. and 180 F. has blended with from 10% to 30% of commerct lithium ,stearate.

2. A plastic sealingcement consisting of a: phaltic road all consisting of 87 percent toppt Panuco crude having a 13.6 gravity, an 180 200 F. flash when diluted with No. 2- furnace c having a to F. flash. a distillation 0! 1 percent at 440, 90 percent at 800, and 650 e: point. such oil mixture being colloidally diapers in from about 10% to 80% of lithium steal-ate.

JOHN'D. HORGAN. RUBBHL I. IDWI. 

